Poultry and pig farmers' respiratory symptoms.
D000818:Animals; D011200:Poultry; D011201:Poultry Diseases / Q000175:diagnosis*; D012140:Respiratory Tract Diseases / Q000145:classification / Q000175:diagnosis / Q000662:veterinary*; D013552:Swine; D013553:Swine Diseases / Q000175:diagnosis*